Add support for CVSS v3 in the API for CVEs

[thorsten-passfeld]

Hello, I was super pleasantly surprised when I found your API. However, one thing that is still missing is a section for the CVSS v3 base vector & score e.g. in https://cve.circl.lu/api/cve/CVE-2020-0001

I've taken a look at the raw JSON that NVD provides and could see that they provide a section "baseMetricV2", which you parse via sbin/db_mgmt_json.py, but there is also a section for CVSS v3 there.

Would it be possible if you could also store this additional information in the future? Or is there a reason why there is no CVSS v3 support as of yet?

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